When you are not feeling particularly friendly but know you ought to be, the best thing you can do, very often, is to put on a friendly manner and behave as if you were a nicer person than you actually are. And in a few minutes, as we have all noticed, you will be really feeling friendlier than you were.
C.S. Lewis (1996). “Joyful Christian”, p.75, Simon and Schuster
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